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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '954c34de961fe6712378487ba891970abcb328631f70621ba96e32cd2434acc0' 
  AND token = 'Wiz8pnLeovlZPXCtMl7OdnidPs/rmu5jraXKeH1D080=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}